US5553982A - Fluid type pusher with thrust indicator - Google Patents

Fluid type pusher with thrust indicator Download PDF

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Publication number
US5553982A
US5553982A US08/288,243 US28824394A US5553982A US 5553982 A US5553982 A US 5553982A US 28824394 A US28824394 A US 28824394A US 5553982 A US5553982 A US 5553982A
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US
United States
Prior art keywords
fluid
piston
cylinder chamber
pressure
thrust
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US08/288,243
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English (en)
Inventor
Yoshito Hashikawa
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JAPAN DEVELOPMENT CONSULTANTS Inc
Japan Dev Consultants Inc
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Japan Dev Consultants Inc
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Publication date
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Assigned to JAPAN DEVELOPMENT CONSULTANTS, INC. reassignment JAPAN DEVELOPMENT CONSULTANTS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HASHIKAWA, YOSHITO
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Publication of US5553982A publication Critical patent/US5553982A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
    • F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/917—Nut having tension feature

Definitions

  • This invention relates to an annular fluid type pusher which is mounted on a shaft to fasten a part set on the shaft and has a pressing piece for pushing the part with fluid pressure, and a fluid pressure adjusting section.
  • FIG. 5 shows an annular fluid type pusher which is a prior development of the present Applicant.
  • the fluid type pusher of FIG. 5 is mounted on a shaft to fasten a part on the shaft and has a pressing piece 16 for pressing the part with fluid pressure, and a fluid pressure adjusting section 13 for adjusting the fluid pressure.
  • the fluid type pusher 11 is mounted on a shaft on which a part is set, and then it is secured with a nut. Under this condition, a pushing screw 14 in the fluid pressure adjusting section 13 is screwed in with a torque wrench 12 fitted with a gauge (hereinafter referred to as "a gauge-fitted torque wrench 12", when applicable) to push a pressurizing piston 15 inwardly thereby to increase the fluid pressure in the fluid type pusher 11. As a result, the pushing piece 16 set between the part and the pusher 11 is moved towards the part to fasten the latter.
  • the gauge-fitted torque wrench which is a precision tool, is expensive. Furthermore, it is liable to be broken when shocked. Hence, it must be handled with great care. Thus, it is rather troublesome to use it at the working site.
  • the torque gauge is limited in the range of graduations. Hence, in the case where it is required to adjust the thrust of the pushing piece in a wide range which is adapted to push the part with fluid pressure, it is necessary to use a plurality of gauge-fitted torque wrenches.
  • the gauge-fitted torque wrench is a torque gauge. Therefore, in order to obtain a thrust value which is actually required for the pushing piece adapted to push a part with fluid pressure, it is essential to perform a mathematical conversion, which makes it rather troublesome to handle the gauge-withfitted torque.
  • the coefficient of friction of the fluid pressure adjusting section depends on the finish accuracy of the threaded portion of the fluid pressure adjusting section, and therefore the value obtained through the conversion may be different from the actual thrust value.
  • an object of this invention is to eliminate the above-described difficulties accompanying a conventional fluid type pusher. More specifically, an object of the invention is to provide a fluid type pressure with a thrust indicator in which the thrust of the pushing piece adapted to push a part with fluid pressure is readily detected by reading a thrust measuring bar which is protruded in proportion to the fluid pressure, thus eliminating the use of an expensive gauge-withfitted torque wrench.
  • the fluid type pusher operates as follows: By operating the fluid pressure adjusting section of the fluid type pusher with a hexagon wrench, which is not expensive, the pressure of fluid in the sealed fluid path is gradually increased, and applied to the cylinder chamber through a communicating path to push the piston outward. As the piston is pushed outward in this manner, the other end portion of the thrust measuring bar which is connected to the piston, is protruded from the outer cylindrical surface of the body of the fluid type pusher.
  • the spring for urging the piston against the pressure the fluid is so selected as to have a predetermined spring constant, and the graduation lines marked on the thrust measuring bar which protrudes from the outer cylindrical surface of the body of the fluid type pusher in proportion to the pressure of fluid are adjusted to be coincident with thrusts to be produced.
  • FIG. 1 is a sectional view of an example of a fluid type pusher with a thrust indicator according to the present invention.
  • FIG. 2 is a front view of the fluid type pusher shown in FIG. 1.
  • FIG. 3 is a front view of another example of the fluid type pusher according to the present invention.
  • FIGS. 4(A) and 4(B) are a front view and a side view, respectively, showing another example of the fluid type pusher according to the present invention.
  • FIG. 5 is a sectional view of a fluid type pusher which was previously developed by the present applicant.
  • FIG. 1 is a sectional view of an example of a fluid type pusher with a thrust indicator (hereinafter referred to merely as "a fluid type pusher", when applicable) which constitutes a first embodiment of the invention.
  • FIG. 2 is a front view of the fluid type pusher shown in FIG. 1.
  • FIG. 3 is a front view of another example of the fluid type pusher, which constitutes a second embodiment of the invention.
  • FIG. 4(A) and 4(B) are a front view and a side view, respectively, showing another example of the fluid type pusher, which constitutes a third embodiment of the invention.
  • the body of the fluid type pusher 1 (hereinafter referred to as "a pusher body", when applicable) is in the form of a ring having a certain thickness, and has a circular through-hole la at the center into which a shaft a is inserted.
  • An annular pushing piece 1c is coupled to one annular end face 1b of the pusher body which abuts against a part b set on the shaft a. The pushing piece 1c pushes against the part b thereby to fasten the latter b.
  • a sealed fluid path 1d is formed in the pusher body.
  • the sealed fluid path 1d is also annular.
  • the pushing piece 1c is partially inserted into the sealed fluid path 1d, so that it is pushed towards the part b by the fluid in the sealed fluid path 1d.
  • the fluid is non-compressive oil or grease.
  • a fluid pressure adjusting section 2 is provided in the pusher body.
  • the fluid pressure adjusting section 2 is to adjust the pressure of fluid in the sealed fluid path 1d.
  • the fluid pressure adjusting section 2 comprises: a pressurizing cylinder chamber 2a; a pressurizing piston 2b slidably fitted in the pressurizing cylinder chamber 2a; and a pushing screw 2c for pushing the pressurizing piston 2b.
  • a pressurizing communicating path 2d is provided between the pressurizing cylinder chamber 2a and the above-described sealed fluid path 1d; that is, the pressurizing cylinder chamber 2a is in communication with the sealed fluid path 1d through the pressurizing communicating path 2d.
  • the pressurizing cylinder chamber 2a is extended from the outer cylindrical surface 1e of the annular pressure body towards the central axis of the through-hole 1a; more specifically it is open in the outer cylindrical surface 1e .
  • the aforementioned pushing screw 2c is provided in the opening of the pressurizing cylinder chamber 2a.
  • the outer portion of the cylindrical surface of the pressurizing cylinder chamber 2a is threaded near the opening formed in the outer cylindrical surface 1e. That is, the pushing screw 2c is threadably engaged with the threaded portion of the cylindrical surface of the pressurizing cylinder chamber 2a, so that the former 2c is threadably moved in the latter 2a.
  • the pressurizing piston 2b slidably fitted in the pressurizing cylinder chamber 2a, is pushed into the pressurizing cylinder chamber 2a by the pushing screw 2c.
  • the inner end face of the pushing screw 2c is in abutment with the outer end face of the pressurizing piston 2b.
  • the pushing screw 2c has a locking hole 2e in the outer end face into which the end portion of a hexagon wrench or the like is inserted to screw in and out the pushing screw 2c.
  • a cylinder chamber 3 is formed in the outer cylindrical surface of the pusher body at the position which is diametrically opposite to the fluid pressure adjusting section 2, being open in the outer cylindrical surface 1e of the pusher body.
  • the cylinder chamber 3 is extended from the outer cylindrical surface 1e towards the central axis of the pusher body.
  • a piston 3a is slidably fitted in the cylinder chamber 3.
  • one end portion of a thrust measuring bar 4 is connected to the outer end face of the piston 3a in such a manner that the other end portion of the thrust measuring bar 4 is exposed outside the cylinder chamber 3 and accordingly outside the outer cylindrical surface 1e of the pusher body.
  • a locking screw 3b is threadably engaged with the opening of the cylinder chamber 3.
  • the locking screw 3b has a through-hole 3c at the center through which the other end portion of the above-described thrust measuring bar 4 is extended to be exposed outside the outer cylindrical surface 1e of the pusher body.
  • a communicating path 3d is provided between the cylinder chamber 3 and the above-described sealed fluid path 1d; that is, the cylinder chamber 3 is in communication with the sealed fluid path 1d through the communicating path 3d.
  • a spring 5 is set in the space defined by the locking screw 3b and the piston 3a, to urge the piston 3a inwardly.
  • the spring 5 has a predetermined spring constant, and it is for instance a coil spring.
  • Thrust graduation lines are marked on the thrust measuring bar 4. When the thrust measuring bar 4 is protruded outside through the hole 3c of the locking screw 3b, the graduation line level with the opening of the hole 3c is read to measure the pressure of fluid in the sealed fluid path 1d.
  • the piston 3a is kept urged inwardly by the spring 5. However, in this case, the piston 3a is slid outwardly against the elastic force of the spring 5. As a result, the amount of protusion through the hole 3 c of the locking screw 3 b of the thrust measuring bar 4 connected to the piston 3a is increased in the amount of protrusion from the hole 3c of the locking screw 3b. Hence, by reading the thrust graduation line on the thrust measuring bar 4 which is level with the opening of the hole 3c, the pressure of fluid in the sealed fluid path 1d can be measured.
  • the fluid type pusher 1 is mounted on the shaft a on which a part b is set, and then fixed to the shaft a with a nut c.
  • a hexagon wrench d is inserted into the locking hole 2e of the pushing screw 2c in the fluid pressure adjusting section 2.
  • the hexagon wrench d is turned to threadably move the pushing screw 2c towards the back of the pressurizing cylinder chamber 2a.
  • the pushing screw 2c is moved towards the back of the pressurizing cylinder chamber while being turned.
  • the pressurizing piston 2b is in abutment with the end of the pushing screw 2c which is being moved towards the back of the pressurizing cylinder chamber 2a.
  • the pressurizing piston 2b is also pushed towards the back of the pressurizing cylinder chamber 2a.
  • the pressure of fluid in the pressurizing cylinder chamber 2a is increased.
  • the pressure of fluid in the sealed fluid path 1d communicating with the pressurizing cylinder chamber 2a is increased equal to the pressure of fluid in the latter 2a.
  • the pushing piece 1c is pushed against the part b by the fluid in the sealed fluid path 1d.
  • the pressure of fluid in the sealed fluid path 1d is increased, the pressure of fluid in the cylinder chamber 3 is also increased which is communicated through the communicating path 3d with the sealed fluid path 1d, so that the pressure of fluid in the cylinder chamber 3 becomes equal to the pressure of fluid in the sealed fluid path 1d.
  • the piston 3a tends to slide outwardly as it is pushed by the pressure.
  • the piston 3a is kept urged in the opposite direction (inwardly) by the spring 5.
  • the piston 3a is moved outwardly against the elastic force of the spring 5.
  • the amount of movement of the piston 3a is proportional to the pressure of fluid.
  • the thrust graduation lines have been marked on the thrust measuring bar 4.
  • the pressure of fluid in the sealed fluid path 1d can be measured. More specifically, by reading the graduation line level with the opening of the hole 3c of the locking screw 3b, the pressure of fluid in the sealed fluid path 1d can be detected.
  • the thrust of the pushing piece 1c pushing the part can be readily measured with the aid of the thrust measuring bar 4, which dispenses with the use of an expensive gauge-withfitted torque wrench.
  • the one end portion of the thrust measuring bar 4 is protruded from the outer cylindrical surface 1e of the fluid type pusher 1.
  • the fluid type pusher may be modified as shown in FIG. 3. That is, a recess if is formed in the outer cylindrical surface 1e, and the cylinder chamber 3 including the piston 3a with the thrust measuring bar 4 is arranged substantially in parallel with the outer cylindrical surface 1e, so that the thrust measuring bar 4 is protruded in the recess if thus formed. That is, in the fluid type pusher thus modified, the thrust measuring bar 4 is prevented from protruding beyond the outer cylindrical surface 1e.
  • the pushing piece 1c is annular; however, the invention is not limited thereto or thereby. That is, as shown in FIG. 4, piston-like pushing pieces 1c may be employed.
  • the inner surface of the through-hole 1a of the pusher body may be threaded so that the pusher body is used as a nut.
  • the thrust of the pushing piece for pushing a part with fluid pressure can be readily read from the thrust measuring bar which is protruded in proportion to the fluid pressure, which dispenses with the use of an expensive gauge-withfitted torque wrench, thus resulting in a large cost reduction. Since the hexagon wrench is inexpensive and scarcely broken, it can be handled readily, and can be used at the working side with ease.
  • the torque gauge is limited in the range of graduations.
  • the thrust is detected by reading the thrust graduation lines of the thrust measuring bar.
  • the spring constant is suitably selected so that, the thrust graduation lines of the thrust measuring bar, which are read at the level of the outer cylindrical surface of the body of the fluid type pusher or of the bottom of the recess formed in the body, coincide with the thrusts which the pushing piece applies to push the part with fluid pressure.
  • the thrust values can be readily detected by reading the thrust graduation lines of the thrust measuring bar which is protruded from the outer cylindrical surface of the body of the fluid type pusher or the bottom of the recess formed therein.
  • the operator can increase or decrease the fluid pressure applied to the pushing piece which is adapted to push the part with fluid pressure, while concurrently monitoring the produced thrust directly with the thrust graduation lines of the thrust measuring bar.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Measuring Fluid Pressure (AREA)
  • Clamps And Clips (AREA)
US08/288,243 1994-05-06 1994-08-09 Fluid type pusher with thrust indicator Expired - Lifetime US5553982A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP6-117537 1994-05-06
JP6117537A JP2990327B2 (ja) 1994-05-06 1994-05-06 推力表示器付流体式押圧器

Publications (1)

Publication Number Publication Date
US5553982A true US5553982A (en) 1996-09-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
US08/288,243 Expired - Lifetime US5553982A (en) 1994-05-06 1994-08-09 Fluid type pusher with thrust indicator

Country Status (5)

Country Link
US (1) US5553982A (de)
JP (1) JP2990327B2 (de)
DE (1) DE4428701A1 (de)
GB (1) GB2289115B (de)
TW (1) TW273586B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5855460A (en) * 1996-06-13 1999-01-05 Wabco Gmbh Screw and nut assembly
US20050058520A1 (en) * 2003-09-12 2005-03-17 Nsk Corporation Hydraulic nut
US20050089386A1 (en) * 2002-02-07 2005-04-28 Kauko Kamppila Tightening member
WO2011102707A1 (es) * 2010-02-22 2011-08-25 Oyervides Ochoa, Luis Gerardo Tuerca hidráulica con sistemas de alerta
WO2015200231A1 (en) * 2014-06-25 2015-12-30 Abel Leo William Locking mechanism with visible status indication
CN113565855A (zh) * 2021-08-24 2021-10-29 沈阳劳克防松液压技术有限公司 一种智能减震抗噪防松预紧器
US20230160402A1 (en) * 2021-11-19 2023-05-25 Spm Oil & Gas Inc. Retainer Nut Assembly for Pump and Methods

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1268861B1 (it) * 1994-12-20 1997-03-13 Femas Srl Ghiera di bloccaggio per alberi rotanti
DE20114265U1 (de) 2001-08-29 2001-11-15 Hazet-Werk Hermann Zerver GmbH & Co. KG, 42857 Remscheid Drehmomentschlüssel
JP5045880B2 (ja) 2006-06-20 2012-10-10 トヨタ自動車株式会社 燃料電池
GB201300093D0 (en) 2013-01-04 2013-02-20 Phipps Maria J Load indicating nut/washer
CN108916532B (zh) * 2017-04-23 2020-05-12 诸暨市合纵科技有限公司 一种便于安装摄像头的管道机器人
CN107605862A (zh) * 2017-10-31 2018-01-19 中国重型机械研究院股份公司 一种往复运动式活塞密封试验装置

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US2571265A (en) * 1945-06-13 1951-10-16 Leufven Axel Gustav Edvard Hydraulic tensioning nut
US3033597A (en) * 1960-08-08 1962-05-08 Frederick L B Miller Means for mounting and dismounting gears and the like on shafting
US3435777A (en) * 1966-05-20 1969-04-01 Wirth Co Kg Masch Bohr Pump,particularly hydraulic pump for drilling plant
US3463044A (en) * 1967-05-05 1969-08-26 Joseph J Rossman Hydraulic holding devices
DE2052788A1 (de) * 1970-09-26 1972-05-04 Löckmann & Sohn GmbH, 5000 Köln Hydraulische Spannmutter mit mechanischer Blockierung
US3779080A (en) * 1971-07-26 1973-12-18 Purex Corp Ltd Gauge recording maximum pressure
SU1418526A1 (ru) * 1987-01-19 1988-08-23 Предприятие П/Я М-5729 Устройство дл определени усили зат жки резьбового соединени
US4777828A (en) * 1986-06-12 1988-10-18 Ferris James E Removable, in-place refrigerant pressure check gauge
US5046906A (en) * 1987-09-29 1991-09-10 Bucknell John W Force applicators

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GB908360A (en) * 1960-02-17 1962-10-17 Harry Freeman Improvements relating to nuts and bolts or screws
DE3148676C2 (de) * 1981-12-09 1985-11-21 Carl Hurth Maschinen- und Zahnradfabrik GmbH & Co, 8000 München Kraftschlüssige lösbare Wellen-Naben-Verbindung

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1631714A (en) * 1926-09-08 1927-06-07 William W Wellman Locomotive-feed-pump gauge
US2571265A (en) * 1945-06-13 1951-10-16 Leufven Axel Gustav Edvard Hydraulic tensioning nut
US3033597A (en) * 1960-08-08 1962-05-08 Frederick L B Miller Means for mounting and dismounting gears and the like on shafting
US3435777A (en) * 1966-05-20 1969-04-01 Wirth Co Kg Masch Bohr Pump,particularly hydraulic pump for drilling plant
US3463044A (en) * 1967-05-05 1969-08-26 Joseph J Rossman Hydraulic holding devices
DE2052788A1 (de) * 1970-09-26 1972-05-04 Löckmann & Sohn GmbH, 5000 Köln Hydraulische Spannmutter mit mechanischer Blockierung
US3779080A (en) * 1971-07-26 1973-12-18 Purex Corp Ltd Gauge recording maximum pressure
US4777828A (en) * 1986-06-12 1988-10-18 Ferris James E Removable, in-place refrigerant pressure check gauge
SU1418526A1 (ru) * 1987-01-19 1988-08-23 Предприятие П/Я М-5729 Устройство дл определени усили зат жки резьбового соединени
US5046906A (en) * 1987-09-29 1991-09-10 Bucknell John W Force applicators

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5855460A (en) * 1996-06-13 1999-01-05 Wabco Gmbh Screw and nut assembly
US20050089386A1 (en) * 2002-02-07 2005-04-28 Kauko Kamppila Tightening member
US7195439B2 (en) * 2002-02-07 2007-03-27 Metso Paper, Inc. Tightening member
US20050058520A1 (en) * 2003-09-12 2005-03-17 Nsk Corporation Hydraulic nut
US7063490B2 (en) * 2003-09-12 2006-06-20 Nsk Corporation Hydraulic nut, device and method for mounting or dismounting a hollow article
US20110203424A1 (en) * 2010-02-22 2011-08-25 Luis Gerardo OYERVIDES OCHOA Hydraulic nut with alarm systems and variable arrangement of advancement and unit total advancement screws through head rotation with flange sensors
WO2011102707A1 (es) * 2010-02-22 2011-08-25 Oyervides Ochoa, Luis Gerardo Tuerca hidráulica con sistemas de alerta
US8480340B2 (en) * 2010-02-22 2013-07-09 Luis Gerardo OYERVIDES OCHOA Hydraulic nut with alarm systems and variable arrangement of advancement and unit total advancement screws through head rotation with flange sensors
WO2015200231A1 (en) * 2014-06-25 2015-12-30 Abel Leo William Locking mechanism with visible status indication
US9416894B2 (en) 2014-06-25 2016-08-16 Leo William Abel Locking mechanism with visible status indication
CN113565855A (zh) * 2021-08-24 2021-10-29 沈阳劳克防松液压技术有限公司 一种智能减震抗噪防松预紧器
US20230160402A1 (en) * 2021-11-19 2023-05-25 Spm Oil & Gas Inc. Retainer Nut Assembly for Pump and Methods
US11859643B2 (en) * 2021-11-19 2024-01-02 Spm Oil & Gas Inc. Retainer nut assembly for pump and methods

Also Published As

Publication number Publication date
JPH07301210A (ja) 1995-11-14
JP2990327B2 (ja) 1999-12-13
DE4428701A1 (de) 1995-11-09
GB2289115A (en) 1995-11-08
GB9416182D0 (en) 1994-09-28
GB2289115B (en) 1998-03-04
TW273586B (de) 1996-04-01

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